The abdominopelvic cavity can be divided into 9 regions by using how many planes?

The abdominopelvic cavity can be divided into 9 regions by using how many planes?

• A. 2
• B. 3
• C. 4
• D. 5

Answer: (C)

Dividing the abdomen into nine regions requires four planes: two vertical planes parallel to the midline and two horizontal planes across the abdomen. The vertical planes create three columns, and the horizontal planes create three rows, producing a 3 by 3 grid of regions. Because you need both sets of planes to form those nine distinct areas, four planes is the correct number. Using fewer planes wouldn’t yield nine regions.

Dividing the abdomen into nine regions requires four planes: two vertical planes parallel to the midline and two horizontal planes across the abdomen. The vertical planes create three columns, and the horizontal planes create three rows, producing a 3 by 3 grid of regions. Because you need both sets of planes to form those nine distinct areas, four planes is the correct number. Using fewer planes wouldn’t yield nine regions.